There are lots of other sites offering free wallpaper and screensavers but none are as much fun to browse as Webshots. On the freebie side you can pick 5 pictures each day, that’s plenty! I have photographs of flowers, holiday scenes, abandoned buildings, quilt squares, etc. Search for whatever comes to mind.
I’m sending the link to Webshots to my Mom. She noticed my wallpaper and asked how I got it and how I made it change automatically.